using System;

public class Program

{

    public static void Main()

    {

        int itemPrice;

        double itemDiscount;

        double grandTotal;

        grandTotal = 0;

        itemPrice = 0;

        Console.WriteLine("Hello, and welcome to the Purchase Calculator!");

        Console.WriteLine("Please enter the price of a purchased item (-1 to stop the calculations): ");

        itemPrice = int.Parse(Console.ReadLine());

        while (itemPrice != -1) 

        {

        Console.WriteLine("This item's cost is: " + itemPrice);

            if (itemPrice >= 50)

            {

                itemDiscount = itemPrice - (itemPrice * 0.10);

            }       

            else

            {

                itemDiscount = itemPrice;

            }

        Console.WriteLine("The item's discounted cost is: " + itemDiscount);

            grandTotal = grandTotal + itemDiscount;

            Console.WriteLine("Please enter the price of a purchased item (-1 to stop the calculations): ");

            itemPrice = int.Parse(Console.ReadLine());

        }

        Console.WriteLine("Your grand total comes out to be: " + grandTotal);

    }

}